While researching the codes this is what I found...
87400 enzyme immunoassay (EIA) technique.
>Blood specimen is serum
>Testing usually in acute phase & repeat again in 10-14 days
>If testing performed separately for Influenza A & B; report twice
87404 immunoassay with direct optical observation
>infection identified by direct detection of the virus in respiratory
secretions (throat swab,nasal aspirate, nasopharyngeal swab or
>specimen usually collected within 1 week of onset of symptoms
> method: EIA with monoclonal antibodies to detect viral antigen
> Again, may bill 2 units for separate results (A & B)
Hope this helps...
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